Add solution notes scaffold and sub-heading format

- roadmap.org: problems now have *** Python and *** C++ sub-headings,
  plus Notes: links to per-problem org files
- scaffold-notes.mjs: creates 199 note files in org/cpp/dsa/<topic>/
  with backlinks to roadmap.org
- 18 topic folders under org/cpp/dsa/ for NeetCode 150 problems
- Updated AGENTS.md with new conventions and workflow

org/cpp/dsa/bit-manipulation/0007-reverse-integer.org

@@ -0,0 +1,8 @@
+* TODO 0007. Reverse Integer :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0007. Reverse Integer][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0136-single-number.org

@@ -0,0 +1,8 @@
+* TODO 0136. Single Number :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0136. Single Number][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0190-reverse-bits.org

@@ -0,0 +1,8 @@
+* TODO 0190. Reverse Bits :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0190. Reverse Bits][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0191-number-of-1-bits.org

@@ -0,0 +1,8 @@
+* TODO 0191. Number of 1 Bits :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0191. Number of 1 Bits][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0231-power-of-two.org

@@ -0,0 +1,8 @@
+* TODO 0231. Power of Two :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0231. Power of Two][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0260-single-number-iii.org

@@ -0,0 +1,8 @@
+* TODO 0260. Single Number III :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0260. Single Number III][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0268-missing-number.org

@@ -0,0 +1,8 @@
+* TODO 0268. Missing Number :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0268. Missing Number][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0338-counting-bits.org

@@ -0,0 +1,8 @@
+* TODO 0338. Counting Bits :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0338. Counting Bits][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/0371-sum-of-two-integers.org

@@ -0,0 +1,8 @@
+* TODO 0371. Sum of Two Integers :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0371. Sum of Two Integers][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/bit-manipulation/2220-minimum-bit-flips-to-convert-number.org

@@ -0,0 +1,8 @@
+* TODO 2220. Minimum Bit Flips to Convert Number :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*2220. Minimum Bit Flips to Convert Number][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src